DE
SWE
Reorganisation of traffic routes in the area of the A5 and A67 motorways and the upgrading of the Darmstadt interchange
Due to structural deficiencies, the three bridge structures at the junction of the A5 and A67 motorways at the Darmstadt Interchange need to be replaced.
As part of the overall project, the bridge structures, the north ramp and the central bridge structure will be demolished and replaced with new structures using composite steel construction. The south ramp will initially be built parallel to the existing structure, but is also due to be demolished at a later date.
The north ramp carries the A67 over the A5 with two lanes. The replacement structure will be built as a single-section, three-span composite steel bridge and will consist of walkable steel box girders. The steel structure will be prefabricated, welded and coated with anti-corrosion protection in the prefabrication hall, and then slid into place in three stages, one span at a time, whilst the A5 motorway below is fully closed. The length of the structure will increase to 170 m as part of this process to accommodate a planned lorry exit lane.
The replacement central structure is being built as a two-part, three-span, wave-shaped trough bridge. Here too, the steel structure is welded together on site in the assembly pit in two sections, coated and then slid into place span by span. The structure now extends over a length of 160 m.
The southern ramp is being constructed as a composite steel structure comprising three steel box girders that are conditionally accessible. The new structure is reduced to 94 metres and is being built alongside the existing structure.
The superstructure for all three bridge structures is due to be completed by the end of 2022.
A particular challenge for us was the simultaneous demolition of the north ramp and the central structure, which was successfully completed within 72 hours. The construction of the three bridge structures also took place simultaneously in order to minimise disruption to ongoing traffic as much as possible. The individual relocation phases of the three steel structures were carried out at weekends, with short road closures which were always completed on schedule.
Whether it be specialised civil engineering, structural engineering, civil engineering and road construction or steel construction – all these trades are carried out by companies within the Eiffage Group. The capabilities within the Eiffage Group are a key factor in the successful delivery of the project.
